2 * eCryptfs: Linux filesystem encryption layer
5 * Copyright (C) 1997-2003 Erez Zadok
6 * Copyright (C) 2001-2003 Stony Brook University
7 * Copyright (C) 2004-2008 International Business Machines Corp.
8 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
9 * Trevor S. Highland <trevor.highland@gmail.com>
10 * Tyler Hicks <tyhicks@ou.edu>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28 #ifndef ECRYPTFS_KERNEL_H
29 #define ECRYPTFS_KERNEL_H
31 #include <keys/user-type.h>
33 #include <linux/fs_stack.h>
34 #include <linux/namei.h>
35 #include <linux/scatterlist.h>
36 #include <linux/hash.h>
37 #include <linux/nsproxy.h>
39 /* Version verification for shared data structures w/ userspace */
40 #define ECRYPTFS_VERSION_MAJOR 0x00
41 #define ECRYPTFS_VERSION_MINOR 0x04
42 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
43 /* These flags indicate which features are supported by the kernel
44 * module; userspace tools such as the mount helper read
45 * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine
47 #define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001
48 #define ECRYPTFS_VERSIONING_PUBKEY 0x00000002
49 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
50 #define ECRYPTFS_VERSIONING_POLICY 0x00000008
51 #define ECRYPTFS_VERSIONING_XATTR 0x00000010
52 #define ECRYPTFS_VERSIONING_MULTKEY 0x00000020
53 #define ECRYPTFS_VERSIONING_DEVMISC 0x00000040
54 #define ECRYPTFS_VERSIONING_HMAC 0x00000080
55 #define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION 0x00000100
56 #define ECRYPTFS_VERSIONING_GCM 0x00000200
57 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
58 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
59 | ECRYPTFS_VERSIONING_PUBKEY \
60 | ECRYPTFS_VERSIONING_XATTR \
61 | ECRYPTFS_VERSIONING_MULTKEY \
62 | ECRYPTFS_VERSIONING_DEVMISC \
63 | ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION)
64 #define ECRYPTFS_MAX_PASSWORD_LENGTH 64
65 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
66 #define ECRYPTFS_SALT_SIZE 8
67 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
68 /* The original signature size is only for what is stored on disk; all
69 * in-memory representations are expanded hex, so it better adapted to
70 * be passed around or referenced on the command line */
71 #define ECRYPTFS_SIG_SIZE 8
72 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
73 #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
74 #define ECRYPTFS_MAX_KEY_BYTES 64
75 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
76 #define ECRYPTFS_DEFAULT_IV_BYTES 16
77 #define ECRYPTFS_FILE_VERSION 0x03
78 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
79 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
80 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
81 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
82 #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
83 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16
84 #define ECRYPTFS_DEFAULT_NUM_USERS 4
85 #define ECRYPTFS_MAX_NUM_USERS 32768
86 #define ECRYPTFS_XATTR_NAME "user.ecryptfs"
88 #define RFC2440_CIPHER_DES3_EDE 0x02
89 #define RFC2440_CIPHER_CAST_5 0x03
90 #define RFC2440_CIPHER_BLOWFISH 0x04
91 #define RFC2440_CIPHER_AES_128 0x07
92 #define RFC2440_CIPHER_AES_192 0x08
93 #define RFC2440_CIPHER_AES_256 0x09
94 #define RFC2440_CIPHER_TWOFISH 0x0a
95 #define RFC2440_CIPHER_CAST_6 0x0b
97 #define RFC2440_CIPHER_RSA 0x01
100 * For convenience, we may need to pass around the encrypted session
101 * key between kernel and userspace because the authentication token
102 * may not be extractable. For example, the TPM may not release the
103 * private key, instead requiring the encrypted data and returning the
106 struct ecryptfs_session_key {
107 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
108 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
109 #define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
110 #define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
112 u32 encrypted_key_size;
113 u32 decrypted_key_size;
114 u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
115 u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
118 struct ecryptfs_password {
122 u32 session_key_encryption_key_bytes;
123 #define ECRYPTFS_PERSISTENT_PASSWORD 0x01
124 #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
126 /* Iterated-hash concatenation of salt and passphrase */
127 u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
128 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
129 /* Always in expanded hex */
130 u8 salt[ECRYPTFS_SALT_SIZE];
133 enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
135 struct ecryptfs_private_key {
138 u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
139 char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
143 /* May be a password or a private key */
144 struct ecryptfs_auth_tok {
145 u16 version; /* 8-bit major and 8-bit minor */
147 #define ECRYPTFS_ENCRYPT_ONLY 0x00000001
149 struct ecryptfs_session_key session_key;
152 struct ecryptfs_password password;
153 struct ecryptfs_private_key private_key;
155 } __attribute__ ((packed));
157 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
158 extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
159 extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
161 struct ecryptfs_key_record {
164 unsigned char sig[ECRYPTFS_SIG_SIZE];
165 unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
168 struct ecryptfs_auth_tok_list {
169 struct ecryptfs_auth_tok *auth_tok;
170 struct list_head list;
173 struct ecryptfs_crypt_stat;
174 struct ecryptfs_mount_crypt_stat;
176 struct ecryptfs_page_crypt_context {
178 #define ECRYPTFS_PREPARE_COMMIT_MODE 0
179 #define ECRYPTFS_WRITEPAGE_MODE 1
182 struct file *lower_file;
183 struct writeback_control *wbc;
187 static inline struct ecryptfs_auth_tok *
188 ecryptfs_get_key_payload_data(struct key *key)
190 return (struct ecryptfs_auth_tok *)
191 (((struct user_key_payload*)key->payload.data)->data);
194 #define ECRYPTFS_SUPER_MAGIC 0xf15f
195 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
196 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
197 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
198 #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
199 #define ECRYPTFS_SALT_BYTES 2
200 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
201 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
202 #define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
203 #define ECRYPTFS_DEFAULT_CIPHER "aes"
204 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
205 #define ECRYPTFS_DEFAULT_HASH "md5"
206 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
207 #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
208 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
209 #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
210 #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
211 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
212 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
213 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
214 #define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
216 #define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
218 #define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
220 #define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
222 /* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
223 * ECRYPTFS_MAX_IV_BYTES */
224 #define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
225 #define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
226 #define MD5_DIGEST_SIZE 16
227 #define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
228 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
229 #define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
230 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
231 #define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
232 #define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
234 struct ecryptfs_key_sig {
235 struct list_head crypt_stat_list;
236 char keysig[ECRYPTFS_SIG_SIZE_HEX];
239 struct ecryptfs_filename {
240 struct list_head crypt_stat_list;
241 #define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
245 char *encrypted_filename;
246 size_t filename_size;
247 size_t encrypted_filename_size;
248 char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
249 char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
253 * This is the primary struct associated with each encrypted file.
255 * TODO: cache align/pack?
257 struct ecryptfs_crypt_stat {
258 #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
259 #define ECRYPTFS_POLICY_APPLIED 0x00000002
260 #define ECRYPTFS_NEW_FILE 0x00000004
261 #define ECRYPTFS_ENCRYPTED 0x00000008
262 #define ECRYPTFS_SECURITY_WARNING 0x00000010
263 #define ECRYPTFS_ENABLE_HMAC 0x00000020
264 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040
265 #define ECRYPTFS_KEY_VALID 0x00000080
266 #define ECRYPTFS_METADATA_IN_XATTR 0x00000100
267 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200
268 #define ECRYPTFS_KEY_SET 0x00000400
269 #define ECRYPTFS_ENCRYPT_FILENAMES 0x00000800
270 #define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00001000
271 #define ECRYPTFS_ENCFN_USE_FEK 0x00002000
272 #define ECRYPTFS_UNLINK_SIGS 0x00004000
274 unsigned int file_version;
276 size_t num_header_bytes_at_front;
277 size_t extent_size; /* Data extent size; default is 4096 */
280 unsigned int extent_mask;
281 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
282 struct crypto_blkcipher *tfm;
283 struct crypto_hash *hash_tfm; /* Crypto context for generating
284 * the initialization vectors */
285 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
286 unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
287 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
288 struct list_head keysig_list;
289 struct mutex keysig_list_mutex;
290 struct mutex cs_tfm_mutex;
291 struct mutex cs_hash_tfm_mutex;
292 struct mutex cs_mutex;
295 /* inode private data. */
296 struct ecryptfs_inode_info {
297 struct inode vfs_inode;
298 struct inode *wii_inode;
299 struct file *lower_file;
300 struct mutex lower_file_mutex;
301 struct ecryptfs_crypt_stat crypt_stat;
304 /* dentry private data. Each dentry must keep track of a lower
306 struct ecryptfs_dentry_info {
307 struct path lower_path;
308 struct ecryptfs_crypt_stat *crypt_stat;
312 * ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
313 * @flags: Status flags
314 * @mount_crypt_stat_list: These auth_toks hang off the mount-wide
315 * cryptographic context. Every time a new
316 * inode comes into existence, eCryptfs copies
317 * the auth_toks on that list to the set of
318 * auth_toks on the inode's crypt_stat
319 * @global_auth_tok_key: The key from the user's keyring for the sig
320 * @global_auth_tok: The key contents
321 * @sig: The key identifier
323 * ecryptfs_global_auth_tok structs refer to authentication token keys
324 * in the user keyring that apply to newly created files. A list of
325 * these objects hangs off of the mount_crypt_stat struct for any
326 * given eCryptfs mount. This struct maintains a reference to both the
327 * key contents and the key itself so that the key can be put on
330 struct ecryptfs_global_auth_tok {
331 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
332 #define ECRYPTFS_AUTH_TOK_FNEK 0x00000002
334 struct list_head mount_crypt_stat_list;
335 struct key *global_auth_tok_key;
336 struct ecryptfs_auth_tok *global_auth_tok;
337 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
341 * ecryptfs_key_tfm - Persistent key tfm
342 * @key_tfm: crypto API handle to the key
343 * @key_size: Key size in bytes
344 * @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
345 * using the persistent TFM at any point in time
346 * @key_tfm_list: Handle to hang this off the module-wide TFM list
347 * @cipher_name: String name for the cipher for this TFM
349 * Typically, eCryptfs will use the same ciphers repeatedly throughout
350 * the course of its operations. In order to avoid unnecessarily
351 * destroying and initializing the same cipher repeatedly, eCryptfs
352 * keeps a list of crypto API contexts around to use when needed.
354 struct ecryptfs_key_tfm {
355 struct crypto_blkcipher *key_tfm;
357 struct mutex key_tfm_mutex;
358 struct list_head key_tfm_list;
359 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
362 extern struct mutex key_tfm_list_mutex;
365 * This struct is to enable a mount-wide passphrase/salt combo. This
366 * is more or less a stopgap to provide similar functionality to other
367 * crypto filesystems like EncFS or CFS until full policy support is
368 * implemented in eCryptfs.
370 struct ecryptfs_mount_crypt_stat {
371 /* Pointers to memory we do not own, do not free these */
372 #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
373 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
374 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
375 #define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008
376 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010
377 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020
378 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040
380 struct list_head global_auth_tok_list;
381 struct mutex global_auth_tok_list_mutex;
382 size_t num_global_auth_toks;
383 size_t global_default_cipher_key_size;
384 size_t global_default_fn_cipher_key_bytes;
385 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
387 unsigned char global_default_fn_cipher_name[
388 ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
389 char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
392 /* superblock private data. */
393 struct ecryptfs_sb_info {
394 struct super_block *wsi_sb;
395 struct ecryptfs_mount_crypt_stat mount_crypt_stat;
398 /* file private data. */
399 struct ecryptfs_file_info {
400 struct file *wfi_file;
401 struct ecryptfs_crypt_stat *crypt_stat;
404 /* auth_tok <=> encrypted_session_key mappings */
405 struct ecryptfs_auth_tok_list_item {
406 unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
407 struct list_head list;
408 struct ecryptfs_auth_tok auth_tok;
411 struct ecryptfs_message {
412 /* Can never be greater than ecryptfs_message_buf_len */
413 /* Used to find the parent msg_ctx */
414 /* Inherits from msg_ctx->index */
420 struct ecryptfs_msg_ctx {
421 #define ECRYPTFS_MSG_CTX_STATE_FREE 0x01
422 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02
423 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x03
424 #define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
426 #define ECRYPTFS_MSG_HELO 100
427 #define ECRYPTFS_MSG_QUIT 101
428 #define ECRYPTFS_MSG_REQUEST 102
429 #define ECRYPTFS_MSG_RESPONSE 103
432 /* Counter converts to a sequence number. Each message sent
433 * out for which we expect a response has an associated
434 * sequence number. The response must have the same sequence
435 * number as the counter for the msg_stc for the message to be
439 struct ecryptfs_message *msg;
440 struct task_struct *task;
441 struct list_head node;
442 struct list_head daemon_out_list;
446 struct ecryptfs_daemon;
448 struct ecryptfs_daemon {
449 #define ECRYPTFS_DAEMON_IN_READ 0x00000001
450 #define ECRYPTFS_DAEMON_IN_POLL 0x00000002
451 #define ECRYPTFS_DAEMON_ZOMBIE 0x00000004
452 #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
454 u32 num_queued_msg_ctx;
457 struct user_namespace *user_ns;
458 struct task_struct *task;
460 struct list_head msg_ctx_out_queue;
461 wait_queue_head_t wait;
462 struct hlist_node euid_chain;
465 extern struct mutex ecryptfs_daemon_hash_mux;
467 static inline struct ecryptfs_file_info *
468 ecryptfs_file_to_private(struct file *file)
470 return (struct ecryptfs_file_info *)file->private_data;
474 ecryptfs_set_file_private(struct file *file,
475 struct ecryptfs_file_info *file_info)
477 file->private_data = file_info;
480 static inline struct file *ecryptfs_file_to_lower(struct file *file)
482 return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
486 ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
488 ((struct ecryptfs_file_info *)file->private_data)->wfi_file =
492 static inline struct ecryptfs_inode_info *
493 ecryptfs_inode_to_private(struct inode *inode)
495 return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
498 static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
500 return ecryptfs_inode_to_private(inode)->wii_inode;
504 ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
506 ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
509 static inline struct ecryptfs_sb_info *
510 ecryptfs_superblock_to_private(struct super_block *sb)
512 return (struct ecryptfs_sb_info *)sb->s_fs_info;
516 ecryptfs_set_superblock_private(struct super_block *sb,
517 struct ecryptfs_sb_info *sb_info)
519 sb->s_fs_info = sb_info;
522 static inline struct super_block *
523 ecryptfs_superblock_to_lower(struct super_block *sb)
525 return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
529 ecryptfs_set_superblock_lower(struct super_block *sb,
530 struct super_block *lower_sb)
532 ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
535 static inline struct ecryptfs_dentry_info *
536 ecryptfs_dentry_to_private(struct dentry *dentry)
538 return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
542 ecryptfs_set_dentry_private(struct dentry *dentry,
543 struct ecryptfs_dentry_info *dentry_info)
545 dentry->d_fsdata = dentry_info;
548 static inline struct dentry *
549 ecryptfs_dentry_to_lower(struct dentry *dentry)
551 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
555 ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
557 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
561 static inline struct vfsmount *
562 ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
564 return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
568 ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
570 ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
574 #define ecryptfs_printk(type, fmt, arg...) \
575 __ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
576 void __ecryptfs_printk(const char *fmt, ...);
578 extern const struct file_operations ecryptfs_main_fops;
579 extern const struct file_operations ecryptfs_dir_fops;
580 extern const struct inode_operations ecryptfs_main_iops;
581 extern const struct inode_operations ecryptfs_dir_iops;
582 extern const struct inode_operations ecryptfs_symlink_iops;
583 extern const struct super_operations ecryptfs_sops;
584 extern const struct dentry_operations ecryptfs_dops;
585 extern struct address_space_operations ecryptfs_aops;
586 extern int ecryptfs_verbosity;
587 extern unsigned int ecryptfs_message_buf_len;
588 extern signed long ecryptfs_message_wait_timeout;
589 extern unsigned int ecryptfs_number_of_users;
591 extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
592 extern struct kmem_cache *ecryptfs_file_info_cache;
593 extern struct kmem_cache *ecryptfs_dentry_info_cache;
594 extern struct kmem_cache *ecryptfs_inode_info_cache;
595 extern struct kmem_cache *ecryptfs_sb_info_cache;
596 extern struct kmem_cache *ecryptfs_header_cache_1;
597 extern struct kmem_cache *ecryptfs_header_cache_2;
598 extern struct kmem_cache *ecryptfs_xattr_cache;
599 extern struct kmem_cache *ecryptfs_key_record_cache;
600 extern struct kmem_cache *ecryptfs_key_sig_cache;
601 extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
602 extern struct kmem_cache *ecryptfs_key_tfm_cache;
603 extern struct kmem_cache *ecryptfs_open_req_cache;
605 struct ecryptfs_open_req {
606 #define ECRYPTFS_REQ_PROCESSED 0x00000001
607 #define ECRYPTFS_REQ_DROPPED 0x00000002
608 #define ECRYPTFS_REQ_ZOMBIE 0x00000004
610 struct file **lower_file;
611 struct dentry *lower_dentry;
612 struct vfsmount *lower_mnt;
613 wait_queue_head_t wait;
615 struct list_head kthread_ctl_list;
618 #define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001
619 int ecryptfs_interpose(struct dentry *hidden_dentry,
620 struct dentry *this_dentry, struct super_block *sb,
622 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
623 struct dentry *lower_dentry,
624 struct inode *ecryptfs_dir_inode,
625 struct nameidata *ecryptfs_nd);
626 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
627 size_t *decrypted_name_size,
628 struct dentry *ecryptfs_dentry,
629 const char *name, size_t name_size);
630 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
631 int ecryptfs_encrypt_and_encode_filename(
633 size_t *encoded_name_size,
634 struct ecryptfs_crypt_stat *crypt_stat,
635 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
636 const char *name, size_t name_size);
637 struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
638 void ecryptfs_dump_hex(char *data, int bytes);
639 int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
641 int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
642 void ecryptfs_rotate_iv(unsigned char *iv);
643 void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
644 void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
645 void ecryptfs_destroy_mount_crypt_stat(
646 struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
647 int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
648 int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
649 int ecryptfs_encrypt_page(struct page *page);
650 int ecryptfs_decrypt_page(struct page *page);
651 int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry);
652 int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
653 int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry);
654 int ecryptfs_read_and_validate_header_region(char *data,
655 struct inode *ecryptfs_inode);
656 int ecryptfs_read_and_validate_xattr_region(char *page_virt,
657 struct dentry *ecryptfs_dentry);
658 u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
659 int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
660 void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
661 int ecryptfs_generate_key_packet_set(char *dest_base,
662 struct ecryptfs_crypt_stat *crypt_stat,
663 struct dentry *ecryptfs_dentry,
664 size_t *len, size_t max);
666 ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
667 unsigned char *src, struct dentry *ecryptfs_dentry);
668 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
669 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
670 int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
671 void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
673 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
674 void *value, size_t size);
676 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
677 size_t size, int flags);
678 int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
679 int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
681 int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
683 int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
684 struct user_namespace *user_ns, struct pid *pid,
686 int ecryptfs_send_message(char *data, int data_len,
687 struct ecryptfs_msg_ctx **msg_ctx);
688 int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
689 struct ecryptfs_message **emsg);
690 int ecryptfs_init_messaging(void);
691 void ecryptfs_release_messaging(void);
694 ecryptfs_write_header_metadata(char *virt,
695 struct ecryptfs_crypt_stat *crypt_stat,
697 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
699 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
700 char *sig, u32 global_auth_tok_flags);
701 int ecryptfs_get_global_auth_tok_for_sig(
702 struct ecryptfs_global_auth_tok **global_auth_tok,
703 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
705 ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
707 int ecryptfs_init_crypto(void);
708 int ecryptfs_destroy_crypto(void);
709 int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
710 int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
711 struct mutex **tfm_mutex,
713 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
714 struct ecryptfs_auth_tok **auth_tok,
716 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
717 loff_t offset, size_t size);
718 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
719 struct page *page_for_lower,
720 size_t offset_in_page, size_t size);
721 int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
723 int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
724 struct inode *ecryptfs_inode);
725 int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
727 size_t offset_in_page, size_t size,
728 struct inode *ecryptfs_inode);
729 struct page *ecryptfs_get_locked_page(struct file *file, loff_t index);
730 int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
731 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
732 struct user_namespace *user_ns);
733 int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
734 size_t *length_size);
735 int ecryptfs_write_packet_length(char *dest, size_t size,
736 size_t *packet_size_length);
737 int ecryptfs_init_ecryptfs_miscdev(void);
738 void ecryptfs_destroy_ecryptfs_miscdev(void);
739 int ecryptfs_send_miscdev(char *data, size_t data_size,
740 struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
741 u16 msg_flags, struct ecryptfs_daemon *daemon);
742 void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
744 ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
745 struct user_namespace *user_ns, struct pid *pid);
746 int ecryptfs_init_kthread(void);
747 void ecryptfs_destroy_kthread(void);
748 int ecryptfs_privileged_open(struct file **lower_file,
749 struct dentry *lower_dentry,
750 struct vfsmount *lower_mnt,
751 const struct cred *cred);
752 int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
754 ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
756 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
757 char *filename, size_t filename_size);
759 ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
761 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
762 char *data, size_t max_packet_size);
763 int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
766 #endif /* #ifndef ECRYPTFS_KERNEL_H */